Valve for hydraulic motors.



No. 65I,334. Patented iunevvIZ, .1900.

A J. H.BAKER, G. F. SHEVLIN & F. H. BAKER.

VALVE FOR HYDRAULIC MOTORS.

(Application led June 27, 1898.) (No Model.) 2 Sheets-Sheet l.

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un. 5|,334. Patented :une l2, |900..

-.|. H. BAKER, F. sHEvLlN & F. H. BAKER.

VALVE FOR HYDR'AU'LICMOTDRS.

(Applimion mea :une 27, 189B.) 2 Sheets-Sheet 2.

(No Model.)

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A .lill/fill!! l vNITED STATES JAMEs H. BAKER,

PATENT OEEICE.a

VALVE FOR HYDRAULIC MOTORS.

SPECIFICATION forming part of Letters Patent No. 651,334, dated J une 12, 1900.

Application filed .Tune 27, 1898. Serial No. 684,604. (No model.)

Toa/ZZ whom, it may concern.-

Be it known that we, JAMES H. BAKER, GEORGE F. SHEvLIN, and FREDERCK H. BAKER, citizens of the United States, yresiding at Saratoga Springs, in the countyof Saratoga and State of New York, have invented an Improvement in Valves for Hydraulic Motors, of which the following is a specification.

Piston-valves in great varieties have been made use of for directing a fluid into a cylinder containing the piston. vention relates to a peculiarly-'constructed piston-valve adapted to admit water under pressure into one end or the other of a cylinder containing a piston the rod of which presses against a block of wood to hold the same against a revolving grinder that reduces the wood to pulp for the manufacture of paper or against some other device to be moved.

The water made use of in paper-mills is very frequently impregnated with acid and mineral substances that are injurious to the valve and chest in the hydraulic motor, and in addition to this such valve is liable to be injured and obstructed by sedimentary or foreign sub'- stances in the water. In our present invention we make use of a cylinder, preferably of cast-iron, with a peculiar base that is'adapted to be bolted to the cylinder forming the watermot-or, and this valve-cylinder is open at the ends, so that it can be bored out to receive a tubular lining of brass, which may be rem ovable, and it is perforated at the respective ports of the valve-chest, so that the perfora- `tions keep back foreign substances that might interfere with the working of the valve, and

this lining can be taken out from time to time, as may be necessary in cleansing the valve and chamber, and the valve itself is in the form of a spool upon a spindle, and end disks or washers are used for confining the cupleathers that surround the valve-stem, with their edges extending toward each other, and the Water or other fluid pressure passes th-rough a port into the spaces between the two pistons or cup-leathers, and two other ports surround the cylinder and communicate with the motor to be actuated, there being holes through the lining of the cylinder at these other ports, such holes allowing the The present in' free passage of the water; but the lining pre- .vents injury to the cup-leathers as they pass In the drawings, Figure lis a sectional plan view. Fig. 2 is a vertical section, and Fig. 3 is a diagram, illustrating the cylinder, piston-rod, and connection to the follower thatlpresses a piece of wood against the grinder; and Fig. 4 shows our improvement'as adapted to two pressures of water.

' The cylinder base and ports are preferably of cast-iron, the cylinderA having end flanges 2 and a base A', adapted to be bolted to the side of the motor-'cylinder B, and in this ino` tor-cylinder are ports 3 and 4, extending to the respective ends, and in thesurface of the base Al are channels or Orts 5 and 6 extendyor other liquid under pressure, so that such supply-pipe can come from either one direction or the other, the hole that is not in use being closedby a screw-plug.

Within the cylinder A is the lining-sleeve O in the form of a tube, of brass or similar material, fitting tightly the inside of the cylinder A, and it is generally advantageous to make this lining-sleeve sufficiently loose to allow for its removal whenever necessary to give access for cleaning the ports of the valve-chest, and around the lining-sleeve fine holes are bored at l2, 13, and 14 in annular ranges or rows adjacent to the respective ports 7, 8, and 9, and the head D is secured to' one end of the cylinder A and the head E to the other end, and in the head E is an opening screw-threaded to form a coupling for the discharge water-pipe, and upon the head D is a stuffing-box or packing-gland 15 for the piston-rod F, the outer end of which is connected to the lever G and by a link I-I to the pivotjaw I, that is screwed to the flange IOO of the cylinder, so that by the lever G the piston-rod F can be moved in one direction or the other by hand.

Within the cylinder A and lining-sleeve C is the piston-valve, having a spool or body K and washers L and M, cup-leathers 17 and 1S, facing each other, and a clamping-nut 19, by which the parts of the piston-valve are held together, and the length of this pistonvalve is such that the cup-leathers will come upon the plain portion of the lining-sleeve between ranges of holes 12 and 14 and the middle range of holes 13, so that when the piston-valve is in the intermediate position the water supplied by the port and holes 13 Will be retained between the cup-leathers and will not pass to either port 7 or 8; but

when the piston-valve is moved in one direction the water under pressure can pass through the holes 14 and port 8, and when moved in the other direction the water can pass through the holes 12 and the port 7 and according to the position of the piston-valve, so that the water under pressure will reach either one end or the other of the motor-cylinder to give motion to the piston B therein in one direction or the other and move the piston-rod B2 and the follower to press the piece of Wood to` be ground into pulp toward the grinder or the reverse or to do other Work.

The port 2O extends through the metal of the cylinder-casting from one end to the other of such cylinder A, and the ends of this port 2O open through the lining-sleeve, such lining-sleeve advantageously being notched to form the openings; but, if desired, numerous perforations might be provided, and the escape-water from the cylinder passes either by 7 or 8 to one end or the other of the cylinder A, and when it passes to the end of the cylinder A, near the gland 15, it goes through port 2O to the other end of the cylinder and thence to the discharge-pipe that is screwed to the head E.

The piston-valve constructed as aforesaid is not liable to injury, it is easily made or repaired, foreign substances that would injure the valve are excluded, the valve can be taken apart and cleaned with facility, and because the pressure is balanced upon the cupleathers the valve can be moved even under heavy pressures with but little power applied to the lever or handle, and the cupleathers are not liable te injury by sand or other foreign substances and can be easily replaced if worn out.

1n Fig. 4 the present valve is represented with two sets of cup-leathers, the object being to make use of water or other fluid at two different pressures, one pressure being` used in returning the apparatus to a normal position and the other pressure for performing being a second spool K upon the elongated I Valve-rod F. If now a liquid is supplied to the port 9 of one pressure and to the port 30 of another pressure, there Wi ll be a liquid of a higher pressure acting at one end of the cylinder B than at the other end, and the proportion of the parts is such that the spool and cup-leathers 17 and 18 act with the inlet 9 and the port 7,leading to the port 5 at one end of the cylinder B, and the spool K and cup-leathers 18 and 32 actin connection with the fluid at a diiferent pressure from the supply pipe or port 30, passing by the port 8 at 6 to one end of the cylinder B for moving the piston and rod in such cylinder in one direction, the escape or exhaust in both instances passing in the reverse direction through the holes 14 or 12 in the tubular sheet-metal lining C and by the pipe or opening 2O to the exhaustspipe connected to the head E of the valve-chest.

In both cases the motion of the piston-valve is arrested in one direction by the collar or washer L engaging the interior of the head D and the collar or washer M engaging the annular seat at the inner end of the head E in the other direction.

We claim as our invention- The combination in a piston-valve with the cylinder having ports cast in the interior thereof, of a lining-tube of brass or similar material perforated with ranges of numerous small holes in line with the ports, a rod, two valve-bodies around the rod, cup-leathers standing in opposite directions at the ends of the valve-bodies, and between one valve-body and the next, and washers around the valverod and adjacent to the end cup-leathers, a clamp for holding the parts of the valve together, a lever for moving the piston-valve, a link and pivot-jaw connected to the cylinderhead and to the lever, there being hubs upon the cylinder forming couplings for a discharge-pipe and forpipes leading water at two diffe-rent pressures to theseparate annular ports surrounding the cup-leather valves, substantially as specified.

Signed by us this 2d day of June, 1898.

JAMES I-I. BAKER. GEO. F. SIIEVLIN. FREDERICK II. BAKER.

Witnesses:

J. W. CRANE, A. A. TRIM.

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